常压下羰基化法精炼镍的原理为:Ni(s)+4CO(g)Ni(CO)4(g)。230℃时,该反

压下羰基化法精炼镍的原理为Ni(s)+4CO(g)Ni(CO)4(g)230℃该反应的平衡常数K=2×10−5。已知:Ni(CO)4的沸点为42.2℃,固体杂质不参与反应。

第一阶段:将粗镍与CO反应转化成气态Ni(CO)4

第二阶段:将第一阶段反应后的气体分离出来,加热至230℃制得高纯镍。

下列判断正确的是

A.增加c(CO),平衡向正向移动,反应的平衡常数增大

B.第一阶段,在30℃50℃两者之间选择反应温度,选50℃

C.第二阶段,Ni(CO)4分解率较低

D.该反应达到平衡时,v生成[Ni(CO)4]=4v生成(CO)

答案

B

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